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Mixed sand and its preparation method and application

A technology of mixed sand and natural sand, applied in the chemical industry, can solve the problems of low product strength in the early stage, uncontrollable mortar quality, low mortar strength, etc. Effect

Active Publication Date: 2021-08-03
中铁建华南建设(广州)高科技产业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, many studies have been carried out on the mixing of tailings or machine-made sand and natural sand to form mortar for construction, but the tailings, machine-made sand and natural sand are directly used in pairs, or the three are used together. It is easy to lead to uncontrollable mortar quality, segregation phenomenon, low slurry yield, low mortar strength, low product strength in the early stage, low yield, low consolidation rate, and prone to cracks and other problems

Method used

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  • Mixed sand and its preparation method and application
  • Mixed sand and its preparation method and application
  • Mixed sand and its preparation method and application

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preparation example Construction

[0076] The present invention also provides a kind of preparation method of above-mentioned mixed sand, comprises the following steps:

[0077] The tailings, machine-made sand and natural sand are mixed.

[0078] The present invention also provides the application of the above-mentioned mixed sand. The technical solution is as follows:

[0079] A dry-mixed mortar prepared from raw materials comprising the following mass percentages:

[0080]

[0081] In one embodiment, the filler is fly ash. Fly ash mainly contains silicon dioxide (SiO 2 ), alumina (Al 2 o 3 ) and iron oxide (Fe 2 o 3 ). (1) Fly ash has a water-reducing effect, so it can reduce the water demand of mortar; the morphological effect and micro-aggregate effect of fly ash can improve the compactness, fluidity and plasticity of mortar, and reduce bleeding and segregation; The setting time of the mortar. After the fly ash is added, the mortar becomes sticky and soft, not easy to bleed, and easy to wipe, w...

Embodiment 1

[0123] This embodiment provides a mixed sand and its preparation method, dry-mixed mortar and its preparation method.

[0124] (1) Composition of mixed sand: see Table 1.

[0125] (2) Preparation of mixed sand: according to the composition ratio in Table 1, directly mix tailings, natural sand and machine-made sand evenly to obtain mixed sand.

[0126] (3) In terms of mass percentage, the composition of dry-mixed mortar is as follows:

[0127] Dry material: 9% cement, 30% fly ash, 10% bentonite, 51% mixed sand; additives: 0.02% by mass of dry material, composed of 0.005% cellulose ether, 0.01% amylase, water reducing Agent 0.005%.

[0128] (4) Preparation of dry-mixed mortar:

[0129] Cement, fly ash, lubricant and auxiliary agent (comprising cellulose ether, suspending agent and water reducer) in the dry material are dosed according to the proportioning ratio, and mixed to obtain mixture A;

[0130] Mix the mixed sand in the dry material with the mixture A, and stir evenly...

Embodiment 2

[0132] This embodiment provides a mixed sand and its preparation method, dry-mixed mortar and its preparation method.

[0133] (1) Composition of mixed sand: see Table 1.

[0134] (2) Preparation of mixed sand: according to the composition ratio in Table 1, directly mix tailings, natural sand and machine-made sand evenly to obtain mixed sand.

[0135] (3) In terms of mass percentage, the composition of dry-mixed mortar is as follows:

[0136] Dry material: 9% cement, 30% fly ash, 10% bentonite, 51% mixed sand; additives: 0.02% by mass of dry material, composed of 0.005% cellulose ether, 0.01% amylase, water reducing Agent 0.005%.

[0137] (4) Preparation of dry-mixed mortar:

[0138] Cement, fly ash, lubricant and auxiliary agent (comprising cellulose ether, suspending agent and water reducer) in the dry material are dosed according to the proportioning ratio, and mixed to obtain mixture A;

[0139] Mix the mixed sand in the dry material with the mixture A, and stir evenly...

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Abstract

The invention relates to a mixed sand and its preparation method and application. The mixed sand is prepared from raw materials including the following mass percentages: 10%-40% of tailings, 20%-40% of machine-made sand, and 32%-60% of natural sand. The mixed sand is light in quality and strong in coordination. Using it to prepare dry-mixed mortar can enhance its anti-segregation effect, and the obtained dry-mixed mortar has strong water retention, good compression and folding resistance, small shrinkage rate, high consolidation rate, stable quality, and all indicators meet the requirements. In addition, it reduces the demand for natural sand, is environmentally friendly, very environmentally friendly, can also reduce production costs, and has broad application prospects.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a mixed sand and its preparation method and application. Background technique [0002] With the rapid development of national urbanization and infrastructure construction, the required natural sand and other consumable building materials have increased dramatically. Therefore, the natural sand used for construction has been excessively exploited, which has destroyed the natural environment. [0003] With the proposal of national ecological civilization construction, how to find a substitute for natural sand and reduce the transition and illegal mining of natural sand is an urgent problem to be solved. According to research, tailings and machine-made sand have been widely concerned because of their large quantity and low price, which can replace part of natural sand. [0004] At present, many studies have been carried out on the mixing of tailings or machine-made sand and natura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B14/18C04B14/06
CPCC04B28/02C04B40/0039C04B18/12C04B14/06C04B24/383C04B2103/302C04B2103/0068C04B18/08C04B14/104C04B2103/0001
Inventor 穆文庆白玮娄存国刘九川
Owner 中铁建华南建设(广州)高科技产业有限公司
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